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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a5768ec4b07806aa813b94f3557cdfe1ae21c2943633f645e443847d2babc6' 
  AND token = 'aIiULSiAR/RILJBxO2nv5C4KekDjwgxKlgVU0TjocSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}